Compilare: user.c: In function ‘main’: user.c:31: warning: implicit declaration of function ‘exit’ user.c:31: warning: incompatible implicit declaration of built-in function ‘exit’ user.c:7: warning: unused variable ‘t’ user.c:6: warning: unused variable ‘m’ user.c:6: warning: unused variable ‘j’ user.c:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result user.c:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result